If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they traveling?
1.0 m/s
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A small aluminum sphere of diameter D, initially at a uniform temperature To, is immersed in a liquid whose temperature, T?, varies sinusoidally according to
T? – Tm = A sin (? t) where: Tm = time-averaged temperature of the liquid A = amplitude of the temperature fluctuation ? = frequency of the fluctuations
If the heat transfer coefficient between the fluid in the sphere, ah , is constant and the system may be treated as ‘lumped capacity,’ derive an expression for the sphere temperature as a function of time.
GIVEN
• A small aluminum sphere is immersed in a liquid whose temperature varies sinusoidally
• Diameter of sphere = D
• Liquid temperature variation: T? – Tm = A sin (? t)
• The heat transfer coefficient = ah (constant)
• The system may be treated as a ‘lumped capacity’
FIND
• An expression for the sphere temperature as a function of time
ASSUMPTIONS
• Constant thermal conductivity
SKETCH
What is a polymorph?
What will be an ideal response?
Which of the following statements about the force attracting these two galaxies is true?
A) It is the same force that causes an apple to fall to the ground. B) It is a force unlike any force that we ever experience on Earth. C) It is a mysterious force, whose nature remains completely unknown to scientists. D) The force will get weaker as time passes.
All of the following are scalars, except
A) mass. B) force. C) temperature. D) distance. E) time.